$ git clone -n https://src.fedoraproject.org/rpms/python-pymatreader.git /var/lib/mock/f41-build-side-1-2755438-31311/root/chroot_tmpdir/scmroot/python-pymatreader
Cloning into '/var/lib/mock/f41-build-side-1-2755438-31311/root/chroot_tmpdir/scmroot/python-pymatreader'...
$ git fetch origin d4c8c89ca72f52ab74e082de71b69381d7bc33b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pymatreader
 * [new ref]         d4c8c89ca72f52ab74e082de71b69381d7bc33b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4c8c89 convert license to SPDX